Starbucks is doubling down on so-called nitro cold brew coffee in the U.S. The impact of half a cup of this java with the edgy name is like consuming two espressos. The promotion is on a roll. The drink is cool, smooth, mellow (not harsh like other coffee) and loved by millenials. Anyway, Starbucks add nitro cold brew to its lineup in its stores in Los Angeles and six other cities this summer. It had previously served the brew exclusively at its higher-end Reserve Roastery and Tasting Rooms. It is dispensed through shiny pipes that look like draft beer taps. Somewhere in there, the nitrogen under pressure is infused into the brew. Baristas are said to vow it gets the caffeine into the blood quicker. Whoa. Starbucks has not said exactly when the nitro coffee will become available and there is no word about Canada.